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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright 2001-2004 The Apache Software Foundation.<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.log4j;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.slf4j.MDC;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Stack;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>/**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * A log4j's NDC implemented in terms of SLF4J MDC primitives.<a name="line.24"></a>
<span class="sourceLineNo">025</span> *<a name="line.25"></a>
<span class="sourceLineNo">026</span> * @since SLF4J 1.6.0<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>public class NDC {<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    public final static String PREFIX = "NDC";<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    public static void clear() {<a name="line.33"></a>
<span class="sourceLineNo">034</span>        int depth = getDepth();<a name="line.34"></a>
<span class="sourceLineNo">035</span>        for (int i = 0; i &lt; depth; i++) {<a name="line.35"></a>
<span class="sourceLineNo">036</span>            String key = PREFIX + i;<a name="line.36"></a>
<span class="sourceLineNo">037</span>            MDC.remove(key);<a name="line.37"></a>
<span class="sourceLineNo">038</span>        }<a name="line.38"></a>
<span class="sourceLineNo">039</span>    }<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>    @SuppressWarnings("rawtypes")<a name="line.41"></a>
<span class="sourceLineNo">042</span>    public static Stack cloneStack() {<a name="line.42"></a>
<span class="sourceLineNo">043</span>        return null;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    @SuppressWarnings("rawtypes")<a name="line.46"></a>
<span class="sourceLineNo">047</span>    public static void inherit(Stack stack) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    static public String get() {<a name="line.50"></a>
<span class="sourceLineNo">051</span>        return null;<a name="line.51"></a>
<span class="sourceLineNo">052</span>    }<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    public static int getDepth() {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        int i = 0;<a name="line.55"></a>
<span class="sourceLineNo">056</span>        while (true) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            String val = MDC.get(PREFIX + i);<a name="line.57"></a>
<span class="sourceLineNo">058</span>            if (val != null) {<a name="line.58"></a>
<span class="sourceLineNo">059</span>                i++;<a name="line.59"></a>
<span class="sourceLineNo">060</span>            } else {<a name="line.60"></a>
<span class="sourceLineNo">061</span>                break;<a name="line.61"></a>
<span class="sourceLineNo">062</span>            }<a name="line.62"></a>
<span class="sourceLineNo">063</span>        }<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return i;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    public static String pop() {<a name="line.67"></a>
<span class="sourceLineNo">068</span>        int next = getDepth();<a name="line.68"></a>
<span class="sourceLineNo">069</span>        if (next == 0) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>            return "";<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span>        int last = next - 1;<a name="line.72"></a>
<span class="sourceLineNo">073</span>        String key = PREFIX + last;<a name="line.73"></a>
<span class="sourceLineNo">074</span>        String val = MDC.get(key);<a name="line.74"></a>
<span class="sourceLineNo">075</span>        MDC.remove(key);<a name="line.75"></a>
<span class="sourceLineNo">076</span>        return val;<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    public static String peek() {<a name="line.79"></a>
<span class="sourceLineNo">080</span>        int next = getDepth();<a name="line.80"></a>
<span class="sourceLineNo">081</span>        if (next == 0) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>            return "";<a name="line.82"></a>
<span class="sourceLineNo">083</span>        }<a name="line.83"></a>
<span class="sourceLineNo">084</span>        int last = next - 1;<a name="line.84"></a>
<span class="sourceLineNo">085</span>        String key = PREFIX + last;<a name="line.85"></a>
<span class="sourceLineNo">086</span>        String val = MDC.get(key);<a name="line.86"></a>
<span class="sourceLineNo">087</span>        return val;<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    public static void push(String message) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>        int next = getDepth();<a name="line.91"></a>
<span class="sourceLineNo">092</span>        MDC.put(PREFIX + next, message);<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    static public void remove() {<a name="line.95"></a>
<span class="sourceLineNo">096</span>        clear();<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>    static public void setMaxDepth(int maxDepth) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>    }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>}<a name="line.102"></a>




























































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